Homework

Computing a t-test using AGE as the independent variable and CSSE (Current statistics self-efficacy) as the dependent measure. We know from research that age 37 is a good cutpoint for our AGE variable. Use tables below to answer the questions.

Note:

¨ Levenes equality of variance tests: a significance value larger than 0.05 is good.

This means the variances for groups DO NOT differ from each other.

- What is Levenes equality of variance tests significance?
- What is the value of
*t*when variances are equal? What about unequal? - Is either value of
*t*significant?

**T-Test**

**Group Statistics**

Age

N

Mean

Std. Deviation

Std. Error Mean

Current Stats Self-Efficacy

>= 37

45

6.44

2.833

.422

< 37

68

6.47

2.391

.290

**Independent Samples Test**

Levene’s Test for Equality of Variances

t-test for Equality of Means

F

Sig.

t

df

Sig. (2-tailed)

Mean Difference

Std. Error Difference

95% Confidence Interval of the Difference

Lower

Upper

Current Stats Self-Efficacy

Equal variances assumed

1.782

.185

-.053

111

.958

-.026

.495

-1.007

.954

Equal variances not assumed

-.051

83.123

.959

-.026

.512

-1.045

.993

Homework

Computing a t-test using AGE as the independent variable and CSSE (Current statistics self-efficacy) as the dependent measure. We know from research that age 37 is a good cutpoint for our AGE variable. Use tables below to answer the questions.

Note:

¨ Levenes equality of variance tests: a significance value larger than 0.05 is good.

This means the variances for groups DO NOT differ from each other.

- What is Levenes equality of variance tests significance?
- What is the value of
*t*when variances are equal? What about unequal? - Is either value of
*t*significant?

**T-Test**

**Group Statistics**

Age

N

Mean

Std. Deviation

Std. Error Mean

Current Stats Self-Efficacy

>= 37

45

6.44

2.833

.422

< 37

68

6.47

2.391

.290

**Independent Samples Test**

Levene’s Test for Equality of Variances

t-test for Equality of Means

F

Sig.

t

df

Sig. (2-tailed)

Mean Difference

Std. Error Difference

95% Confidence Interval of the Difference

Lower

Upper

Current Stats Self-Efficacy

Equal variances assumed

1.782

.185

-.053

111

.958

-.026

.495

-1.007

.954

Equal variances not assumed

-.051

83.123

.959

-.026

.512

-1.045

.993